"…deaths caused to others by bicycles"

By simply doing that you'd just fuel the belief in the saying "there are damned lies and statistics". It does not make sense to compare the killing potential of a motor powered vehicle with one powered by a human.

The issue is simple and straightforward. As I've mentioned elsewhere, many cyclists have unpredictable riding habits and a high propensity to violate traffic law at the drop of a hat—which, on a per capita basis, is much more frequent than that of licenced drivers. There's no disputing the accuracy of that statement although there's argument over the actual numbers.

By their unpredictable riding habits and regular violations of the road rules, cyclists put motorists into invidious situations where they are more likely to have an accident with a cyclist (or pedestrian, or other vehicle or thing whilst desperately trying to avoid the cyclist).

Licensing cyclists won't solve everything but it'd sure improve their safety. If cyclists knew they could lose their license thus not be allowed to drive on public roads then their riding behavior would be more predictable and we would see many fewer traffic violations (such as running red lights which I see happen regularly). Moreover, motorists' behavior would be more predictable with licenced cyclists on the road because their behavior has become more predictable through them being licensed. All up, licensing cyclists would mean fewer accidents.